/* =========================================================
   VPNBu · 博客样式包(列表页 + 文章页)
   全部设计值取自 :root 令牌,组件内不散落硬编码色值
   ========================================================= */

/* ---------------------------------------------------------
   1. 列表页:杂志头版(H1 ≤ 3rem)
   --------------------------------------------------------- */
.blog-hero {
  padding-block: clamp(2.2rem, 5vw, 3.6rem) 0;
}

.mag-rule {
  height: 4px;
  border-radius: var(--r-pill);
  background-image: linear-gradient(90deg, var(--accent) 0 58%, var(--warn) 58% 100%);
}

.mag-kicker {
  margin-top: 1.15rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--accent-dark);
}

.blog-hero h1 {
  margin-top: .45rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4.6vw, 3rem);
  line-height: 1.14;
  letter-spacing: -.018em;
  color: var(--text);
  text-wrap: pretty;
}

.mag-desc {
  margin-top: .95rem;
  max-width: 44rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-muted);
}

/* 标签筛选 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.6rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--border);
}

.filter-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-muted);
  border-radius: var(--r-pill);
  padding: .42rem 1.05rem;
  font-family: inherit;
  font-size: .9rem;
  line-height: 1.5;
  cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}

.filter-btn:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
  transform: translateY(-1px);
}

.filter-btn[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--on-accent);
  box-shadow: var(--accent-shadow-lite);
}

.filter-btn:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 2px;
}

/* 文章卡列表 */
.blog-list-sec {
  padding-block: clamp(1.8rem, 4vw, 2.6rem) clamp(2.4rem, 5vw, 3.4rem);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(19rem, 1fr));
  gap: 1.15rem;
}

.post-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  padding: 1.35rem 1.4rem 1.2rem;
  box-shadow: var(--accent-shadow-lite);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}

.post-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--accent-shadow);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  font-size: .82rem;
  color: var(--text-faint);
}

.post-meta time {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .02em;
}

.post-card h3 {
  font-size: 1.16rem;
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
  text-wrap: pretty;
}

.post-card h3 a {
  color: inherit;
  text-decoration: none;
}

.post-card h3 a:hover {
  color: var(--accent-dark);
}

.post-card p {
  font-size: .94rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.card-foot {
  margin-top: auto;
  padding-top: .5rem;
  font-size: .88rem;
  font-weight: 600;
  color: var(--accent-dark);
  text-decoration: none;
}

.card-foot::after {
  content: " →";
}

.list-empty {
  padding-block: 2.4rem;
  text-align: center;
  color: var(--text-muted);
}

/* ---------------------------------------------------------
   2. 文章页:统一阅读列(52~57rem)
   面包屑 / hero / 正文 / 推广 / 上下篇 / 延伸阅读共用一列
   --------------------------------------------------------- */
.reading-wrap,
.article-hero:not(.reading-wrap) {
  width: 100%;
  max-width: calc(56rem + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 面包屑:与页头之间留呼吸空间 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin-top: 1.6rem;
  padding-top: .2rem;
  font-size: .84rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--accent-dark);
}

.breadcrumb .sep {
  color: var(--text-faint);
}

.breadcrumb [aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

/* 文章 hero:杂志头版(粗刊头线 → meta → 标题 → 摘要 → 细分隔线) */
.article-hero {
  padding-block: .3rem 1.85rem;
  border-bottom: 1px solid var(--border);
}

.article-hero .mag-rule {
  margin-top: 1.1rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  margin-block: 1rem .85rem;
  font-size: .82rem;
  color: var(--text-muted);
}

.article-meta .meta-chip {
  display: inline-flex;
  align-items: center;
  padding: .16rem .7rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: color-mix(in srgb, var(--bg-panel) 72%, transparent);
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-muted);
}

.article-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.75rem, 3.6vw, 2.6rem);
  line-height: 1.2;
  letter-spacing: -.018em;
  color: var(--text);
  text-wrap: pretty;
}

.article-summary {
  margin-top: .95rem;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--text-muted);
}

/* ---------------------------------------------------------
   3. 文章正文排版
   --------------------------------------------------------- */
.article-body {
  padding-block: clamp(1.6rem, 3.5vw, 2.2rem) 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text);
  counter-reset: h2count;
}

.article-body > * + * {
  margin-top: 1.05em;
}

.article-body p {
  margin: 0;
}

.article-body h2 {
  counter-increment: h2count;
  margin-top: 2.5em;
  margin-bottom: .75em;
  font-size: 1.55rem;
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: -.012em;
  color: var(--text);
  text-wrap: pretty;
}

.article-body h2::before {
  content: counter(h2count, decimal-leading-zero);
  display: inline-block;
  margin-right: .55rem;
  padding-right: .55rem;
  border-right: 2px solid var(--accent);
  font-family: var(--font-mono);
  font-size: .68em;
  font-weight: 700;
  color: var(--accent);
  vertical-align: .16em;
  letter-spacing: .02em;
}

.article-body h3 {
  margin-top: 1.9em;
  margin-bottom: .55em;
  font-size: 1.22rem;
  line-height: 1.45;
  font-weight: 700;
  color: var(--text);
  text-wrap: pretty;
}

.article-body ul,
.article-body ol {
  padding-left: 1.35rem;
}

.article-body li + li {
  margin-top: .45em;
}

.article-body li::marker {
  color: var(--accent);
}

.article-body a {
  color: var(--accent-dark);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: .18em;
}

.article-body a:hover {
  text-decoration-color: var(--accent);
}

.article-body strong {
  font-weight: 700;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: var(--r-tag);
}

.article-body hr {
  height: 1px;
  border: 0;
  margin-block: 2.2rem;
  background: var(--border);
}

.article-body blockquote {
  margin-block: 1.6rem;
  padding: .9rem 1.15rem;
  border-left: 3px solid var(--border);
  border-radius: 0 var(--r-tag) var(--r-tag) 0;
  background: var(--bg-panel3);
  color: var(--text-muted);
  font-style: normal;
}

.article-body :not(pre) > code {
  font-family: var(--font-mono);
  font-size: .88em;
  padding: .1em .38em;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-panel2);
  color: var(--accent-dark);
}

/* 终端窗代码块 */
.article-body pre {
  position: relative;
  margin-block: 1.6rem;
  padding: 2.1rem 1.15rem 1.1rem;
  border-radius: var(--r-panel);
  background: var(--text);
  color: var(--bg-panel3);
  box-shadow: var(--accent-shadow-lite);
  font-family: var(--font-mono);
  font-size: .85rem;
  line-height: 1.7;
  overflow-x: auto;
}

.article-body pre::before {
  content: "";
  position: absolute;
  top: .85rem;
  left: 1.15rem;
  width: .52rem;
  height: .52rem;
  border-radius: 50%;
  background: var(--error);
  box-shadow: 1rem 0 0 var(--warn), 2rem 0 0 var(--success);
}

.article-body pre code {
  display: block;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font-size: 1em;
}

/* 表格:实色表头 + 斑马纹 + hover,窄屏横滑 */
.article-body table {
  width: 100%;
  margin-block: 1.6rem;
  border-collapse: collapse;
  background: var(--bg-panel);
  font-size: .92rem;
  line-height: 1.65;
}

.article-body thead th {
  padding: .7rem .85rem;
  background: var(--text);
  color: var(--bg-panel);
  font-weight: 700;
  text-align: left;
  white-space: nowrap;
}

.article-body tbody td {
  padding: .68rem .85rem;
  border-top: 1px solid var(--border);
  vertical-align: top;
}

.article-body tbody tr:nth-child(even) {
  background: var(--bg-panel3);
}

.article-body tbody tr:hover {
  background: var(--accent-soft);
}

@media (max-width: 860px) {
  .article-body table {
    display: block;
    width: fit-content;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* 数据卡网格:三档色调变化 */
.article-body .stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(10.5rem, 1fr));
  gap: .85rem;
  margin-block: 1.7rem;
}

.article-body .stat-card {
  padding: 1rem 1.05rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--r-panel);
  background: var(--bg-panel);
  box-shadow: var(--accent-shadow-lite);
}

.article-body .stat-card:nth-child(3n + 2) {
  border-top-color: var(--warn);
  background: var(--warn-soft);
}

.article-body .stat-card:nth-child(3n + 3) {
  border-top-color: var(--success);
  background: var(--success-soft);
}

.article-body .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--accent-dark);
}

.article-body .stat-card:nth-child(3n + 2) .stat-num {
  color: var(--warn-ink);
}

.article-body .stat-card:nth-child(3n + 3) .stat-num {
  color: var(--success);
}

.article-body .stat-label {
  display: block;
  margin-top: .35rem;
  font-size: .86rem;
  line-height: 1.6;
  color: var(--text-muted);
}

/* 勾叉清单:只做容器与行卡装饰,标记由 li 文本自带 */
.article-body .check-list {
  display: grid;
  gap: .55rem;
  margin-block: 1.5rem;
  padding-left: 0;
  list-style: none;
}

.article-body .check-list li {
  margin-top: 0;
  padding: .75rem .95rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r-tag);
  background: var(--bg-panel3);
  line-height: 1.7;
}

.article-body .check-list li::marker {
  content: none;
}

/* 结论块 */
.article-body .verdict {
  margin-block: 1.7rem;
  padding: 1.05rem 1.2rem 1.05rem 1.35rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-tag) var(--r-tag) 0;
  background: var(--accent-soft);
  line-height: 1.8;
}

.article-body .verdict strong {
  color: var(--accent-dark);
}

/* 提示块:左色条 + 伪元素图标徽 */
.article-body .callout {
  position: relative;
  margin-block: 1.6rem;
  padding: 1rem 1.15rem 1rem 3.1rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--r-tag) var(--r-tag) 0;
  background: var(--bg-panel3);
  line-height: 1.8;
}

.article-body .callout::before {
  content: "i";
  position: absolute;
  left: 1rem;
  top: 1.05rem;
  display: grid;
  place-items: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--on-accent);
  font-family: var(--font-mono);
  font-size: .8rem;
  font-weight: 700;
  line-height: 1;
}

.article-body .callout p {
  margin: 0;
}

.article-body .callout p + p {
  margin-top: .6rem;
}

.article-body .callout-warn {
  border-left-color: var(--warn);
  background: var(--warn-soft);
}

.article-body .callout-warn::before {
  content: "!";
  background: var(--warn);
  color: var(--text);
}

.article-body .callout-ok {
  border-left-color: var(--success);
  background: var(--success-soft);
}

.article-body .callout-ok::before {
  content: "✓";
  background: var(--success);
  color: var(--on-accent);
}

/* ---------------------------------------------------------
   4. 文末推广卡(全站唯一)
   --------------------------------------------------------- */
.promo-block {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.1rem;
  width: 100%;
  max-width: 56rem;
  margin-block: clamp(2rem, 4vw, 2.8rem) 0;
  margin-inline: auto;
  padding: 1.5rem 1.6rem;
  border-radius: var(--r-card);
  background-image: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: var(--on-accent);
  box-shadow: var(--accent-shadow);
  overflow: hidden;
}

.promo-block::after {
  content: "";
  position: absolute;
  top: -3rem;
  right: -3rem;
  width: 10rem;
  height: 10rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--on-accent) 12%, transparent);
  pointer-events: none;
}

.promo-copy {
  position: relative;
  z-index: 1;
  max-width: 34rem;
}

.promo-brand {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--on-accent) 80%, transparent);
}

.promo-copy p {
  margin-top: .4rem;
  font-size: .98rem;
  line-height: 1.75;
}

.promo-block .btn {
  position: relative;
  z-index: 1;
}

.promo-block .btn-primary {
  background: var(--bg-panel);
  border-color: var(--bg-panel);
  color: var(--accent-dark);
}

.promo-block .btn-primary:hover {
  background: var(--bg-panel3);
  border-color: var(--bg-panel3);
}

.promo-block .btn-secondary {
  background: transparent;
  border-color: color-mix(in srgb, var(--on-accent) 55%, transparent);
  color: var(--on-accent);
}

.promo-block .btn-secondary:hover {
  background: color-mix(in srgb, var(--on-accent) 14%, transparent);
}

/* ---------------------------------------------------------
   5. 上一篇 / 下一篇 + 延伸阅读
   两者垫距之和 ≤ 5rem,避免叠出空白空洞
   --------------------------------------------------------- */
#post-nav {
  padding-block: 2.1rem 2.2rem;
}

.post-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: .9rem;
}

.post-nav-card {
  display: block;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--border);
  border-radius: var(--r-panel);
  background: var(--bg-panel);
  color: inherit;
  text-decoration: none;
  transition: border-color .18s ease, background-color .18s ease, transform .18s ease;
}

.post-nav-card:hover {
  border-left-color: var(--accent);
  background: var(--bg-panel3);
  transform: translateY(-2px);
}

.post-nav-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
}

.post-nav-title {
  display: block;
  margin-top: .35rem;
  font-size: .98rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text);
}

#related-posts {
  padding-block: 0 1.6rem;
}

.related-title {
  margin-bottom: 1rem;
  font-size: 1.35rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.012em;
  color: var(--text);
}

.related-title::after {
  content: "";
  display: block;
  width: 3rem;
  height: 3px;
  margin-top: .55rem;
  border-radius: var(--r-pill);
  background: var(--accent);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15.5rem, 1fr));
  gap: .9rem;
}

.related-card {
  display: flex;
  flex-direction: column;
  gap: .45rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--border);
  border-top: 3px solid transparent;
  border-radius: var(--r-panel);
  background: var(--bg-panel);
  box-shadow: var(--accent-shadow-lite);
  transition: border-color .18s ease, transform .18s ease, box-shadow .2s ease;
}

.related-card:hover {
  border-top-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--accent-shadow);
}

.related-card h3 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
  text-wrap: pretty;
}

.related-card h3 a {
  color: inherit;
  text-decoration: none;
}

.related-card h3 a:hover {
  color: var(--accent-dark);
}

.related-card p {
  font-size: .88rem;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------------------------------------------------------
   6. 悬浮 CTA(文章页专用;本站 components.css 未含此组件)
   列表页不放,窄屏收成小胶囊不遮正文
   --------------------------------------------------------- */
.float-cta {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .68rem 1.15rem .68rem .95rem;
  border-radius: var(--r-pill);
  background: var(--accent);
  color: var(--on-accent);
  font-size: .92rem;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  box-shadow: var(--accent-shadow);
  transition: background-color .18s ease, transform .18s ease;
}

.float-cta:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
}

.float-cta svg {
  width: 1.05rem;
  height: 1.05rem;
  flex: none;
}

.float-cta:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .float-cta {
    right: .8rem;
    bottom: .8rem;
    padding: .6rem .95rem;
    font-size: .86rem;
  }
}

/* ---------------------------------------------------------
   7. 标签样式兜底(blog 列表与卡片共用)
   --------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: .14rem .62rem;
  border-radius: var(--r-pill);
  font-size: .76rem;
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: .01em;
  white-space: nowrap;
}

.tag-guide {
  background: var(--accent-soft);
  color: var(--accent-dark);
}

.tag-network {
  background: var(--mist);
  color: var(--accent-dark);
}

.tag-security {
  background: var(--success-soft);
  color: var(--success);
}

.tag-streaming {
  background: var(--warn-soft);
  color: var(--warn-ink);
}

.tag-ai {
  background: var(--bg-panel2);
  color: var(--text-muted);
}

.tag-news {
  background: var(--error-soft);
  color: var(--error);
}

/* ---------------------------------------------------------
   8. 响应式与动效降级
   --------------------------------------------------------- */
@media (max-width: 900px) {
  .post-grid {
    grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr));
  }
}

@media (max-width: 640px) {
  .no-break {
    white-space: normal;
  }

  .blog-hero {
    padding-block: 1.6rem 0;
  }

  .post-grid,
  .related-grid,
  .post-nav-grid {
    grid-template-columns: 1fr;
  }

  .promo-block {
    padding: 1.25rem 1.15rem;
  }

  .promo-block .btn {
    width: 100%;
    justify-content: center;
  }

  .article-body pre {
    font-size: .8rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .post-card,
  .filter-btn,
  .post-nav-card,
  .related-card,
  .float-cta {
    transition: none;
  }

  .post-card:hover,
  .filter-btn:hover,
  .post-nav-card:hover,
  .related-card:hover,
  .float-cta:hover {
    transform: none;
  }
}